Banners render incorrectly upon world upgrade

Banners in worlds upgrade from previous versions render incorrectly, appearing to use random sprites. From my testing, this does not appear to affect new worlds, or worlds that did not have banners before 25w41a, but does affect new banners placed in an upgraded world that already had banners.

Attachments: Second image is in version 1.21.10, third image is the same banner after upgrading to 25w41a.